The IQ of children generally inherits more from their mothers, because the IQ level and the X chromosome are closely related. The mother’s chromosome is XX, while the father’s chromosome is XY, of which X only accounts for 1/2, while the mother’s chromosome is all X. Therefore, the child’s IQ is inherited more from the mother. It is clear from the above that if the mother is stimulated by adverse factors during pregnancy, such as viral infection or excessive exposure to radioactive substances, this will affect the child’s IQ development. In addition, if the child’s mother has a very low IQ level, such as congenital stupidity, schizophrenia and other problems, the child’s IQ is often greatly affected.